Tata Consultancy Services' Chief Operating Officer N Ganapathy Subramaniam will retire next month after working with the company for over 40 years. "No single individual can replace him...We are re-distributing the work he's been doing and we don't intend to appoint a new COO," TCS CEO K Krithivasan said. Subramaniam is the elder brother of Tata Sons Chairman N Chandrasekaran.